Finding the Fourth Proportional to 1,436.21, 1,981.81 and 806.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.21 : 1,981.81 = 806.74 : x
2. Step 2: Convert to fraction form
   1,436.21/1,981.81 = 806.74/x
3. Step 3: Cross multiply
   1,436.21x = 1,981.81 × 806.74
4. Step 4: Simplify right side
   1,436.21x = 1,598,805.40
5. Step 5: Solve for x
   x = 1,598,805.40/1,436.21
6. Step 6: Final answer
   x = 1,113.21